72 lines
1.2 KiB
Go
72 lines
1.2 KiB
Go
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package auth
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import (
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"sync"
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"forge.cadoles.com/Cadoles/guesstimate/internal/model"
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"github.com/antonmedv/expr"
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"github.com/antonmedv/expr/vm"
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"github.com/pkg/errors"
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)
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var (
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ErrUnexpectedRuleResult = errors.New("unexpected rule result")
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)
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type Service struct {
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rules []*vm.Program
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mutex sync.RWMutex
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}
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func (s *Service) LoadRules(rawRules ...string) error {
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rules := make([]*vm.Program, 0, len(rawRules))
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for _, rr := range rawRules {
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r, err := expr.Compile(rr)
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if err != nil {
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return errors.WithStack(err)
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}
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rules = append(rules, r)
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}
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s.mutex.Lock()
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s.rules = rules
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s.mutex.Unlock()
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return nil
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}
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func (s *Service) Authorize(user *model.User) (bool, error) {
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s.mutex.RLock()
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defer s.mutex.RUnlock()
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env := map[string]interface{}{
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"user": user,
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}
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for _, r := range s.rules {
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result, err := expr.Run(r, env)
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if err != nil {
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return false, errors.WithStack(err)
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}
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authorized, ok := result.(bool)
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if !ok {
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return false, errors.WithStack(ErrUnexpectedRuleResult)
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}
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if !authorized {
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return false, nil
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}
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}
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return true, nil
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}
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func NewService() *Service {
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return &Service{
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rules: make([]*vm.Program, 0),
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}
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}
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